(3) Normal ECG (Johnston)

Question 1

Draw out a normal EKG with:

P wave

QRS complex

T wave

U wave

Answer 1

Question 2

Draw out a normal EKG with:

PR interval

PR segment

QRS interval

ST segment

QT interval

Answer 2

Question 3

What does each SMALL SQUARE represent in time?

Answer 3

0.04 seconds

Question 4

What does each LARGE square represent in time?

Answer 4

0.2 seconds

Question 5

PR interval should not exceed ____ seconds

Answer 5

0.2

Question 6

If the PR interval is longer than 0.2 seconds, that indicates…

Answer 6

1st degree AV BLOCK

Question 7

What is the PRIMARY pacemaker of the heart?

Answer 7

SA node

Question 8

If the SA node fails, what takes over as the pacemaker of the heart?

Answer 8

AV node

Question 9

What event is occuring during the p wave?

Answer 9

Atrial Depolarization

Question 10

P Wave

Should be upright in:

Answer 10

Leads I and II

V4, V5 and V6

AVF

Question 11

P wave should be inverted in:

Answer 11

AVR

Question 12

Describe what the P-R interval is:

Answer 12

Beginning of P wave to beginning of QRS complex

*Time from SA Node to ventricular muscle fiber

Question 13

What is the normal range for the P-R interval?

Answer 13

0.12- 0.20 seconds

(3 small squares to 5 small squares)

Question 14

What event occurs during the QRS complex?

Answer 14

Ventricular Depolarization

Question 15

What is the normal time frame for the QRS complex?

Answer 15

0.05-0.10 seconds

Question 16

Q waves shouldn’t be more than ___ seconds in width

Answer 16

0.03 seconds

Question 17

What are you looking for with the ST segment?

Answer 17

Observing the level relative to baseline and shape

Normally is isoelectric

Question 18

What is occuring during the T Wave?

Answer 18

Ventricular repolarization

Question 19

QT duration can give us insight into the following pathologies:

Answer 19

Myocardial Ischemia

Myocardial Injury

Myocardial Infarction

Question 20

Pathologies:

What would indicate a pathology with a T wave?

Answer 20

INVERTED T WAVE = indicates an ischemic pattern

TALL UPRIGHT T WAVES = Hyperkalemia

Question 21

P-R should be less than…

Answer 21

0.2 seconds

Question 22

QRS should be less than…

Answer 22

0.12 seconds

Question 23

What heart rate is considered tachycardia?

Answer 23

HR > 100

Question 24

What heart rate is considered bradycardia?

Answer 24

HR < 60

Question 25

Describe how you would calculate Heart Rate:

(300 method)

Answer 25

Question 26

Describe how you calculate Heart Rate:

(1500 method)

Answer 26

Question 27

What is a good indicator you have a sinus rhythm?

Answer 27

P wave precedes QRS

Question 28

What does it mean if the p wave follows the QRS?

Answer 28

SVT

Junctional rhythm

Question 29

What does an absence of P waves indicate?

Answer 29

Atrial fibrillation

Atrial flutter

Junctional or ventricular escape rhythms

Junctional tachycardia

VT

Question 30

Draw out the six leads of the standard EKG with their degree values:

Answer 30

Question 31

Describe where the

Normal Axis

Left Axis

Right Axis

Extreme Right Axis

Answer 31